Messages in this thread Patch in this message | | | From | Konrad Rzeszutek Wilk <> | Subject | [PATCH 1/4] xen/p2m: Optimize the get_phys_to_machine function a bit. | Date | Tue, 3 Jul 2012 11:40:35 -0400 |
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Running perf tells me that the check for p2m_identity is done a lot - more than it should.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> --- arch/x86/xen/p2m.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c index 64effdc..161bcdc 100644 --- a/arch/x86/xen/p2m.c +++ b/arch/x86/xen/p2m.c @@ -406,7 +406,7 @@ unsigned long get_phys_to_machine(unsigned long pfn) * and in p2m_*missing, so returning the INVALID_P2M_ENTRY * would be wrong. */ - if (p2m_top[topidx][mididx] == p2m_identity) + if (unlikely(p2m_top[topidx][mididx] == p2m_identity)) return IDENTITY_FRAME(pfn); return p2m_top[topidx][mididx][idx]; -- 1.7.7.6
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